气象学报2026，Vol.84Issue(4)：652-667,16.DOI:10.11676/qxxb2026.20250163
单年和多年印度洋偶极子事件对南极海冰影响的对比分析
Distinctive impacts of single-and multi-year Indian Ocean Dipole events on changes of Antarctic sea ice
摘要
Abstract
Using a nearly 1000-year pre-industrial control simulation from the CESM2 Earth System Model in the CMIP6 archive,we identify positive Indian Ocean Dipole(pIOD)events and categorize them into single-year and consecutive multi-year(two-and three-year)types based on their duration.Direct comparisons between different types are conducted to reveal their impacts on Antarctic spring sea ice and atmospheric circulation.Results show that the sea ice anomaly pattern triggered by pIOD events is strongly duration-dependent.Single-year events lead to a dipole pattern in the West Antarctic,whereas the pattern induced by multi-year events is characterized by eastward shift and meridional expansion of the anomaly centers.The lower tropospheric circulation anomalies,guided by Rossby wave trains,are the key mechanism underlying these differences.Sea ice anomalies are modulated by dynamic processes(Ekman transport and thermal advection)and are closely associated with thermodynamic processes(downwelling shortwave and longwave radiation).Compared with single-year events,multi-year events tend to generate more persistent and stronger Rossby wave trains,which maintain and intensify the pIOD impacts on Antarctic sea ice.Furthermore,quantitative sea ice mass budget analysis reveals that changes in sea ice mass are mainly attributed to dynamic processes,basal melting,lateral melting and snow-to-ice conversion.关键词
印度洋偶极子/南极海冰/环流异常/海冰质量收支Key words
Indian Ocean Dipole/Antarctic sea ice/Circulation anomalies/Sea ice mass budget分类
天文与地球科学引用本文复制引用
夏子涵,朱珠,刘骥平..单年和多年印度洋偶极子事件对南极海冰影响的对比分析[J].气象学报,2026,84(4):652-667,16.基金项目
国家重点研发计划项目(2024YFF0506600)、南方海洋科学与工程广东省实验室(珠海)全球-区域-近岸跨尺度海洋碳循环数值模拟与评估项目(SML2024SP023). （2024YFF0506600）
